ANTENTOP-
01- 2012, # 016
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Ground Plane for the 40,-30,-20 and 17- meter Bands
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Antenna may tune in the resonance by length of the radials
and changing inductance of the inductors (by squeeze/stretch). Table
2 shows data for the antenna measured by MFJ- 259-B. There are shown data
for two antenna locations at the roof. "Variant 1"shows
data for initial installation of the antenna. Then antenna for some
reason was relocated to other place. "Variant 2" shows
the data for the other installation of the antenna.
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The places were almost equal to each other. The difference
is in the length of the coaxial cable going from my transceiver
to the antenna. Length of the cable at "Variant 1" was
18- meter. Length of the cable at "Variant 2" was 40.6-
meter.
References
- http://www.dl2kq.de/ant/3-3.htm
- http://www.antentop.org/ua1dz.htm
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Table 2
Data for Two Variants of Installation of the Ground Plane Antenna
Variant 1
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Variant 2
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F, MHz
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SWR
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R
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X
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F,
MHz
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SWR
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R
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X
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18.200
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1.1
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52
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7
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18.170
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1.0
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49
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3
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18.068
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1.2
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58
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8
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18.068
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1.1
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56
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4
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14.100
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1.1
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44
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3
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14.110
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1.0
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50
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4
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14.000
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1.2
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46
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8
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14.000
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1.2
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56
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7
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14.200
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1.2
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41
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0
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14.200
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1.1
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46
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6
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14.300
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1.3
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36
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0
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14.300
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1.3
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44
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11
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14.370
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1.5
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33
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0
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14.350
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1.3
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44
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14
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10.110
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1.0
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49
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3
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10.100
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1.1
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46
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7
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1.150
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1.1
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46
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4
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10.150
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1.1
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45
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4
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7.000
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1.1
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49
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6
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7.000
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1.2
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41
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6
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7.100
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1.1
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45
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4
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7.100
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1.0
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50
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1
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7.200
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1.4
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37
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8
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7.200
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1.3
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62
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7
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Capacitors K15U-1
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Ground Plane. Box
with matching circuits
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www.antentop.org
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Page-45
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